638863468065 has 48 divisors (see below), whose sum is σ = 1149075607680. Its totient is φ = 328115854080.

The previous prime is 638863468057. The next prime is 638863468073. The reversal of 638863468065 is 560864368836.

638863468065 is a `hidden beast` number, since 6 + 38 + 86 + 3 + 468 + 0 + 65 = 666.

It is an interprime number because it is at equal distance from previous prime (638863468057) and next prime (638863468073).

It is not a de Polignac number, because 638863468065 - 2³ = 638863468057 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 638863467993 and 638863468011.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 2187700 + ... + 2462469.

It is an arithmetic number, because the mean of its divisors is an integer number (23939075160).

Almost surely, 2^638863468065 is an apocalyptic number.

It is an amenable number.

638863468065 is a deficient number, since it is larger than the sum of its proper divisors (510212139615).

638863468065 is a wasteful number, since it uses less digits than its factorization.

638863468065 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4650294 (or 4650291 counting only the distinct ones).

The product of its (nonzero) digits is 119439360, while the sum is 63.

The spelling of 638863468065 in words is "six hundred thirty-eight billion, eight hundred sixty-three million, four hundred sixty-eight thousand, sixty-five".